Fix to make getPlaylist function apply cachebusting for Phone/Tablet browsers

I would like to submit this bug fix which adjusts the getPlaylist function in player_lib.js to use the cache: false flag on its ajax request. This fixes a bug on my local setup where if you view the playlist tab using a phone or tablet you would always see old data.

I tested it on my Lumia 2520 using Internet Explorer, and also on my Lumia 920 phone also using IE. I also tested using Chrome on my desktop and all three cases work.